We stayed for 3 weeks in this very nice apartment, everything was just as described. Close to the BTS (Bang Na) and great amenities, supermarket and café in the same building, very long pool and gym. Local market and street food 10-15 minutes walking distance. Great view of the city skyline. Quiet and good Aircon, fast wifi.
Would definitely recommend staying here if you don't mind being a bit further away/taking the BTS to get to other parts of town.
The only downside we noticed was that we only had one keycard, which you need to get into the building and operate the elevators (up and down). There was also one short power outage during our stay, but that only lasted for about 15 minutes. As some have described, you can hear the BTS a bit, especially in the bedroom, but it wasn't loud enough to really bother us. Otherwise, it was all really quiet and calm.